Question 4010 of 234 · California Wastewater Operator Exam
Which microscopic organism is commonly found in a healthy, well-settling activated sludge with moderate sludge age?
Exactly one answer is correct.
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Correct answer to question 4010
- D: Stalked ciliates and rotifers
Explanation
Stalked ciliates and rotifers indicate a stable, mature sludge with good effluent quality. A predominance of flagellates and amoebae suggests young sludge or a recent upset.
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